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IM 1F6A0-01E
7-3
7. MAINTENANCE
7.2 Adjustment for Manual Mode
YEWFLO does not need the initial adjustment because
YEWFLO is always adjusted by itself automatically.
These adjustments should be done in case that
indicator reads over zero at zero flow.
7.2.1 Low Cut Adjustment
Adjust to noise elimination or zero flow in the low flowrate
( or low frequency) range.
The settable range for low cut flowrate is below half of
minimum flowrate.
7.2.2 Tuning
This adjustment should be done according to a flow figure
shown below.
START
Is it zero flow?
No
No
Stop flow to be zero
Yes
Yes
Set "TUNING AT ZERO"
of "K25:N.B MODE"
Wait more than 30 seconds
Ensure the complete of the
tuning function.
Is indication reads zero
at zero flow?
Finishing the tuning
functios
Retry the tuning and ensure
the pipeline conditions?
Ensure TLA value
F070202.EPS
Tuning flow
If this adjustment is executed, the following value is
changed.
K25:N.B MODE = MANUAL
K26:NOISE RATIO=Constant value
Minimum flowrate is increased when TLA value is
changed form initial value.
1. Tuning method
(1) Ensure the condition of flowrate
The necessary condition for tuning function is zero
flow.
(2) Executing the tuning function.
Set “ TUNING AT ZERO” of “K25:N.B MODE”.
Wait more 30 second.
(3) Finishing the tuning functions
Using the BT200
(a) Press “DATA” key of BT200 function key.
(b) Ensure the indication of “MANUAL” which is
“K25:N.B MODE”
(“NOW TUNING” is indicated during tuning operation.)
Using the indicator
(a) Press “SHIFT” and “SET” key simultaneously.
(b) Press “SET” key and ensure “01” of Lower
indication.
(“02” is indicated during tuning operation. Execute (a),
(b) once again.)
2. TLA value
TLA values is possible to change after executing “TUN-
ING”. In this case, minimum flowrate is increased.
Minimum flowrate for TLA value is given by below
equation.
Minimum Flowrate
after changing TLA
Value
Specified Minimum
Flowrate
TLA Value after Tuning
TLA initial value or defalt value
F070201.EPS
Ensure minimum flowrate for changing TLA value.
3. Output
After tuning, ensure that the indication reads is zero where
no fluid is flowing.
If the indication reads over zero is done continuously, retry
the tuning and ensure the below condition.
Does high vibrations occur in pipeline?
In this case, refer to “3:INSTALLATION” .